Illustration showing the nuclear composition of an atom of lithium-7 (atomic number: 3), the most common isotope of the element lithium (Li). The nucleus consists of 3 protons (red) and 4 neutrons (yellow). Lithium is an alkali metal. In elemental form, it is a soft reactive metal that is less dense than water, melting at 180 degrees Celsius.

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TOP29776380

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達志影像

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